// @nuget: EntityFramework

​

using System;

using System.Data.Entity;

using System.Linq;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations.Schema;

using System.ComponentModel.DataAnnotations;

​

public class Program

{

    public static void Main()

    {

        using (var context = new BookStore())

        {

            Author author = new Author()

            {

                Name = "Mark",

                Biography = new AuthorBiography()

                {

                    Biography = "Biography",

                    DateOfBirth = DateTime.Now,

                    PlaceOfBirth = "NY",

                    Nationality = "US"

                }

            };

            context.Authors.Add(author);

​

            context.SaveChanges();

            var authorData = context.Authors.ToList();

            var authorBio = context.AuthorBiographies.ToList();

            FiddleHelper.WriteTable(authorData);

            FiddleHelper.WriteTable(authorBio);

        }

    }

    public class BookStore : DbContext

    {

        public BookStore() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            modelBuilder.Entity<Author>()

                .HasOptional(a => a.Biography)

                .WithRequired(ab => ab.Author);

        }

​

        public DbSet<Author> Authors { get; set; }

        public DbSet<AuthorBiography> AuthorBiographies { get; set; }

    }

​

    public class AuthorBiography

    {

        public int AuthorBiographyId { get; set; }

        public string Biography { get; set; }

        public DateTime DateOfBirth { get; set; }

        public string PlaceOfBirth { get; set; }

        public string Nationality { get; set; }

        public virtual Author Author { get; set; }

    }

​

    public class Author

    {

        public int AuthorId { get; set; }

        public string Name { get; set; }

        public virtual AuthorBiography Biography { get; set; }

    }

}